Fixed a11y errors

Author: Eric Olkowski

packages/react-core/src/components/Menu/examples/MenuOptionMultiSelect.tsx

@@ -17,7 +17,7 @@ export const MenuOptionMultiSelect: React.FunctionComponent = () => {
   return (
     <Menu selectVariant="multi" onSelect={onSelect} activeItemId={0} selected={selectedItems}>
       <MenuContent>
-        <MenuList>
+        <MenuList aria-label="Menu multi select example">
           <MenuItem itemId={0}>Option 1</MenuItem>
           <MenuItem itemId={1}>Option 2</MenuItem>
           <MenuItem icon={<TableIcon aria-hidden />} itemId={2}>

packages/react-core/src/components/Menu/examples/MenuOptionSingleSelect.tsx

@@ -14,7 +14,7 @@ export const MenuOptionSingleSelect: React.FunctionComponent = () => {
   return (
     <Menu selectVariant="single" onSelect={onSelect} activeItemId={activeItem} selected={selectedItem}>
       <MenuContent>
-        <MenuList>
+        <MenuList aria-label="Menu single select example">
           <MenuItem itemId={0}>Option 1</MenuItem>
           <MenuItem itemId={1}>Option 2</MenuItem>
           <MenuItem icon={<TableIcon aria-hidden />} itemId={2}>